概述
最近在做日历相关的需求，也踩了不少坑，做一些整理，方便以后用。
相关方法
- 获得月份天数
/**
* 通过年份和月份 得到当月的日数
*/
public static int getMonthDays(int year, int month) {
month++;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
case 2:
if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
return 29;
} else {
return 28;
}
default:
return -1;
}
}
- 像个日期相差几周
这里只用到三年的日期，所以逻辑是三年以内的，要有其他需求，需要调整部分逻辑
/**
* 两个日期距离几周
*/
public static int getWeeksNum(int lastYear, int lastMonth, int lastDay, int year, int month, int day) {
int startDayOfWeek = 0;
try {
startDayOfWeek = dayForWeek(lastYear + "-" + lastMonth + "-" + lastDay);
} catch (Exception e) {
e.printStackTrace();
}
int endDayOfWeek = 0;
try {
endDayOfWeek = dayForWeek(year + "-" + month + "-" + day);
} catch (Exception e) {
e.printStackTrace();
}
int startDayOfYear = 0;
try {
startDayOfYear = dayForYear(lastYear + "-" + lastMonth + "-" + lastDay);
} catch (ParseException e) {
e.printStackTrace();
}
int endDayOfYear = 0;
try {
endDayOfYear = dayForYear(year + "-" + month + "-" + day);
} catch (ParseException e) {
e.printStackTrace();
}
int dayNum;
if (lastYear == year) {
dayNum = (endDayOfYear - endDayOfWeek) - (startDayOfYear - startDayOfWeek);
} else if (lastYear < year) {
if ((year - lastYear) == 1) {
dayNum = ((getMonthDays(lastYear, 2) + 337)
- (startDayOfYear - startDayOfWeek))
+ (endDayOfYear - endDayOfWeek);
} else {
dayNum = ((getMonthDays(lastYear, 2) + 337) - (startDayOfYear - startDayOfWeek))
+ (getMonthDays(lastYear + 1, 2) + 337)
+ (endDayOfYear - endDayOfWeek);
}
} else {
if ((lastYear - year) == 1) {
dayNum = ((getMonthDays(year, 2) + 337)
- (endDayOfYear - endDayOfWeek))
+ (startDayOfYear - startDayOfWeek);
} else {
dayNum = ((getMonthDays(year, 2) + 337) - (startDayOfYear - startDayOfWeek))
+ (getMonthDays(year + 1, 2) + 337)
+ (startDayOfYear - startDayOfWeek);
}
}
int weekNum = dayNum / 7;
return weekNum;
}
- 获得该日期在一周中第几天
/**
* 获得该日期在一周中第几天
* 日：1 一：2 二：3 三：4 四：5 五：6 六：7
*/
public static int dayForWeek(String time) throws Exception {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
c.setTime(format.parse(time));
int dayForWeek = c.get(Calendar.DAY_OF_WEEK);
return dayForWeek;
}
- 获得该日期在一年中第几天
/**
* 获得该日期在一年中第几天
*/
public static int dayForYear(String time) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
c.setTime(format.parse(time));
int dayForYear = c.get(Calendar.DAY_OF_YEAR);
return dayForYear;
}
- 根据国历获取假期
/**
* 根据国历获取假期
*/
public static String getHolidayFromSolar(int year, int month, int day) {
String message = "";
if (month == 0 && day == 1) {
message = "元旦";
} else if (month == 1 && day == 14) {
message = "情人节";
} else if (month == 2 && day == 8) {
message = "妇女节";
} else if (month == 2 && day == 12) {
message = "植树节";
} else if (month == 3) {
if (day == 1) {
message = "愚人节";
} else if (day >= 4 && day <= 6) {
if (year <= 1999) {
int compare = (int) (((year - 1900) * 0.2422 + 5.59) - ((year - 1900) / 4));
if (compare == day) {
message = "清明节";
}
} else {
int compare = (int) (((year - 2000) * 0.2422 + 4.81) - ((year - 2000) / 4));
if (compare == day) {
message = "清明节";
}
}
}
} else if (month == 4 && day == 1) {
message = "劳动节";
} else if (month == 4 && day == 4) {
message = "青年节";
} else if (month == 4 && day == 12) {
message = "护士节";
} else if (month == 5 && day == 1) {
message = "儿童节";
} else if (month == 6 && day == 1) {
message = "建党节";
} else if (month == 7 && day == 1) {
message = "建军节";
} else if (month == 8 && day == 10) {
message = "教师节";
} else if (month == 9 && day == 1) {
message = "国庆节";
} else if (month == 10 && day == 11) {
message = "光棍节";
} else if (month == 11 && day == 25) {
message = "圣诞节";
}
return message;
}
- 将时间戳转换为日期
/**
* 将时间戳转换为日期
*/
public static String stampToDate(long s) {
String res;
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
long lt = new Long(s);
Date date = new Date(lt);
res = simpleDateFormat.format(date);
String[] select = res.split("-");
int month = Integer.valueOf(select[1]) - 1;
String monthStr = (month < 10) ? "0" + month : month + "";
res = select[0] + "-" + monthStr + "-" + select[2];
return res;
}
备注
相关的网上也有较多的介绍！这里只记录几个用到的！
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